Add email curation link to 'more' drop down in admin nav

https://www.pivotaltracker.com/story/show/60252246
Simplify cucumber step to get build green again

For some reason, the "Save" step fails randomly. There isn't actually
any need to save the collection after removing the document from it,
so I'm just removing the save step to get the build green again.
Merge pull request #1027 from alphagov/add-email-curation-link-to-nav

Add email curation link to 'more' drop down in admin nav

https://www.pivotaltracker.com/story/show/60252246